Markets are generally efficient, so probably a wash.
Older homes will probably have somewhat bigger lots and better locations. Newer homes will probably have more younger couples with kids in the immediate neighborhood.
10-25 years ago the new home trend was big great rooms and master beds and high ceilings. Now it is splitting the big master bed into two smaller rooms and a “modular” setup to accommodate adult children or elderly parents with greater privacy.
Personally I like older big room trend more. I love the open space inside and don’t have a TV requiring a formal living and TV centered family room setup. I also feel cramped in big house on small lot areas like Carmel Valley and most newer NCC developments. I also feel like they seem smaller than their interior square footage because there is less open space around them to see out the windows.
My view on timing is buy now because next summer prices will likely be 10% higher. A high income couple will get huge tax deductions. I easily got a low rate 5% down mortgage for my first purchase, locked in my low price, then did a refi once I saved up enough to do 20% down a year later.